YES We show the termination of the relative TRS R/S: R: minus(x,|0|()) -> x minus(s(x),s(y)) -> minus(x,y) quot(|0|(),s(y)) -> |0|() quot(s(x),s(y)) -> s(quot(minus(x,y),s(y))) S: rand(x) -> x rand(x) -> rand(s(x)) -- SCC decomposition. Consider the non-minimal dependency pair problem (P, R), where P consists of p1: minus#(s(x),s(y)) -> minus#(x,y) p2: quot#(s(x),s(y)) -> quot#(minus(x,y),s(y)) p3: quot#(s(x),s(y)) -> minus#(x,y) and R consists of: r1: minus(x,|0|()) -> x r2: minus(s(x),s(y)) -> minus(x,y) r3: quot(|0|(),s(y)) -> |0|() r4: quot(s(x),s(y)) -> s(quot(minus(x,y),s(y))) r5: rand(x) -> x r6: rand(x) -> rand(s(x)) The estimated dependency graph contains the following SCCs: {p2} {p1} -- Reduction pair. Consider the non-minimal dependency pair problem (P, R), where P consists of p1: quot#(s(x),s(y)) -> quot#(minus(x,y),s(y)) and R consists of: r1: minus(x,|0|()) -> x r2: minus(s(x),s(y)) -> minus(x,y) r3: quot(|0|(),s(y)) -> |0|() r4: quot(s(x),s(y)) -> s(quot(minus(x,y),s(y))) r5: rand(x) -> x r6: rand(x) -> rand(s(x)) The set of usable rules consists of r1, r2, r3, r4, r5, r6 Take the reduction pair: lexicographic combination of reduction pairs: 1. weighted path order base order: matrix interpretations: carrier: N^2 order: standard order interpretations: quot#_A(x1,x2) = ((1,0),(0,0)) x1 + ((0,0),(0,1)) x2 + (0,1) s_A(x1) = x1 minus_A(x1,x2) = x1 |0|_A() = (1,0) quot_A(x1,x2) = ((1,0),(0,0)) x1 rand_A(x1) = x1 + (1,0) precedence: quot# = s = minus = |0| = quot = rand partial status: pi(quot#) = [] pi(s) = [] pi(minus) = [] pi(|0|) = [] pi(quot) = [] pi(rand) = [] 2. weighted path order base order: matrix interpretations: carrier: N^2 order: standard order interpretations: quot#_A(x1,x2) = x1 + (1,0) s_A(x1) = x1 + (2,1) minus_A(x1,x2) = x1 + (0,1) |0|_A() = (2,0) quot_A(x1,x2) = ((1,0),(1,0)) x1 + (3,1) rand_A(x1) = (0,0) precedence: |0| = rand > quot > s > minus > quot# partial status: pi(quot#) = [1] pi(s) = [1] pi(minus) = [1] pi(|0|) = [] pi(quot) = [] pi(rand) = [] The next rules are strictly ordered: p1 We remove them from the problem. Then no dependency pair remains. -- Reduction pair. Consider the non-minimal dependency pair problem (P, R), where P consists of p1: minus#(s(x),s(y)) -> minus#(x,y) and R consists of: r1: minus(x,|0|()) -> x r2: minus(s(x),s(y)) -> minus(x,y) r3: quot(|0|(),s(y)) -> |0|() r4: quot(s(x),s(y)) -> s(quot(minus(x,y),s(y))) r5: rand(x) -> x r6: rand(x) -> rand(s(x)) The set of usable rules consists of r1, r2, r3, r4, r5, r6 Take the reduction pair: lexicographic combination of reduction pairs: 1. weighted path order base order: matrix interpretations: carrier: N^2 order: standard order interpretations: minus#_A(x1,x2) = ((1,0),(1,0)) x2 + (1,0) s_A(x1) = ((1,1),(0,0)) x1 minus_A(x1,x2) = ((1,0),(1,1)) x1 + (0,1) |0|_A() = (1,0) quot_A(x1,x2) = ((1,0),(0,0)) x1 rand_A(x1) = ((1,1),(0,1)) x1 + (1,1) precedence: minus# = s = minus = |0| = quot = rand partial status: pi(minus#) = [] pi(s) = [] pi(minus) = [] pi(|0|) = [] pi(quot) = [] pi(rand) = [] 2. weighted path order base order: matrix interpretations: carrier: N^2 order: standard order interpretations: minus#_A(x1,x2) = ((1,1),(0,1)) x2 + (1,0) s_A(x1) = ((1,1),(0,1)) x1 + (2,0) minus_A(x1,x2) = x1 + (0,1) |0|_A() = (1,0) quot_A(x1,x2) = ((1,0),(0,0)) x1 rand_A(x1) = (0,0) precedence: minus > quot > s > minus# > |0| = rand partial status: pi(minus#) = [2] pi(s) = [] pi(minus) = [] pi(|0|) = [] pi(quot) = [] pi(rand) = [] The next rules are strictly ordered: p1 We remove them from the problem. Then no dependency pair remains.